We all pine for a time in life when things were simpler. Even when they weren't necessarily simpler, hindsight makes them look a lot simpler. The reality of it was that it wasn't.
If the career you have chosen has some unexpected inconvenience, console yourself by reflecting that no career is without them.
But if somebody dies, if something happens to you, there is a normal process of depression, it is part of being human, and some people view it as a learning experience etc.

